Verify Accelerometer Power and Constant Current Supply
December 21, 2018
Back to: Preserving VR Hardware Accuracy
Configure VibrationVIEW
Figure 3.1. Configuring accelerometer power.
- Open VibrationVIEW and connect the workstation PC to the VR9500.
- Turn on the accelerometer power for Ch 1 to 4.
Check ICP Voltage
- Connect three (3) 50-ohm terminators to Channels 2, 3, and 4.
- Read the voltage on a DMM (Agilent 34410A or Agilent 34401A)
- Insert the BNC connector into the two holes on the top right of the DMM’s front panel. The BNC cable should be to the right.
- Press the shift key on the lower right and then press the top left button marked V DC.
Figure 3.2. Connecting the VR9500 to the DMM.
- Connect Ch 1 to the DMM and measure milliamperes (I) DC.
- Measure and record amperage between pin (+) and shell (-) (3.55mA + or – 1.66mA = 2.49 – 4.61mA tolerance).
- Measure the accelerometer power current for each channel. Any channel not being measured should have a 50-ohm terminator to prevent any leakage across channels. Record the data in the table below.
| Ch1 | Vdc = V Tolerance = 24V ± 2.4V (21.6V – 26.4V) |
| Ch1 | Idc = mA Tolerance = 3.55mA ± 1.06mA (2.49mA – 4.61mA) |
| Ch2 | Vdc = V Tolerance = 24V ± 2.4V (21.6V – 26.4V) |
| Ch2 | Idc = mA Tolerance = 3.55mA ± 1.06mA (2.49mA – 4.61mA) |
| Ch3 | Vdc = V Tolerance = 24V ± 2.4V (21.6V – 26.4V) |
| Ch3 | Idc = mA Tolerance = 3.55mA ± 1.06mA (2.49mA – 4.61mA) |
| Ch4 | Vdc = V Tolerance = 24V ± 2.4V (21.6V – 26.4V) |
| Ch4 | Idc = mA Tolerance = 3.55mA ± 1.06mA (2.49mA – 4.61mA) |